beautiful" isn't just catchy. it's got a great message. ♪ you don't know you're beautiful, oh, oh,. ♪ that's what makes you beautiful ♪ >> stephen: "you don't know you're beautiful. that's what makes you beautiful." first of all, great dating advice. ( laughter ) remember, girls, low self-esteem, very attractive to men. guys always go for the low-hanging fruit, okay, easy pickin 's. second, the liibs are incredibly complex, because the boys are singing, "you don't know whew beautiful. that's what headaches you beautiful" but they've just told the girl she's beautiful. so since she now knows it, she's no longer beautiful. ( laughter ) ( applause ) but-- stick with me. stick with me. oh, it goes deeper. okay, but she's listening to the song, too.